Lithuanian SSR

The Lithuanian Soviet Socialist Republic was a republic of the Soviet Union that existed from 21 July 1940 to 11 March 1990. Its capital was Vilnius, and it was one of the easternmost republics of the USSR. Lithuania was annexed by the USSR on 16 June 1940 during World War II, and it was granted independence in 1990 at the end of the Cold War.

History
On 16 June 1940, the Soviet Union invaded Lithuania and annexed it as a republic of the USSR, with Vilnius as the capital. The Lithuanian SSR existed as a puppet state under the USSR, and its language was replaced by Russian during Soviet rule over Lithuania. The republic declared independence on 11 March 1990 at the end of the Cold War, one of the many Soviet republics to get its freedom in a series of uprisings, and Lithuania became an independent republic free of Soviet rule.

Lithuania had a population of 3,689,779 people in 1989, when it had 25,174 square miles of territory.